Masturbation in primates was linked to STD prevention and reproductive success.
But then the research team thought that since self-pleasuring is so common throughout the animal kingdom, there has to be a bigger and clearer explanation.
by UCL. From this data set, the researchers tracked the distribution of self-pleasuring behavior across primates to understand when and why it evolved in both females and males.The Postcopulatory Selection hypothesis was further divided into two constituents – the Sexual Arousal hypothesis and the Sperm Quality hypothesis.
The other thesis, Pathogen Avoidance, predicted that masturbation after a sexual encounter, in both males and females, helps prevent sexually transmitted infections . These postcopulatory genital grooming strategies include oral self-cleaning, urination, and masturbation to clean the reproductive tract with ejaculation.
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